A New Strategy of Coupling Pyroelectric and Piezoelectric Effects for Photoresponse Enhancement of a Cu(In, Ga)Se2 Heterojunction Photodetector. (25th September 2022)

• Record Type: Journal Article
• Authors: Liu, Jihong; Liang, Zidong; Chen, Jingwei; Wang, Shufang; Pan, Caofeng; Qiao, Shuang
• Is Part Of: Advanced functional materials. Volume 32:Number 48(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-09-25
• Subjects: photodetectors -- piezo‐phototronic effects -- pyro‐phototronic effect -- self‐powered -- ZnO nanowires; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202208658
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Pyro/piezoelectric effects are thought as essential ways to modulate photoresponses of optoelectronic devices, but the pyro/piezoelectric materials usually function as photoactive or fundamental band matching layers. In this manuscript, a Cu(In, Ga)Se2 (CIGS) multilayer heterojunction of Glass/Mo/CIGS/CdS/ZnO nanowire/ITO is prepared as a self‐powered photodetector (PD). The PD exhibits excellent performances in 405 to 1064 nm with maximum responsivity ( R ) of 0.455 A W −1, and detectivity ( D ) of 7.22 × 10 11 Jones at zero bias. More importantly, the temperature variation‐induced pyroelectric field in the non‐photoactive ZnO layer is demonstrated to facilitate the transport of carriers. After introducing the pyroelectric effect, the responsivity ( R) and detectivity ( D) are largely increased to 4.92 A W −1 and 7.81 × 10 12 Jones, respectively, and an ultrafast response time of 67.13/78.57 µs is obtained. Meanwhile, the response wavelength is extended to 1550 nm, which is far beyond the spectral limitation of the heterojunction. Besides, the piezoelectric effect of the ZnO nanowire can further optimize the band alignment and then boost the photovoltaic and pyroelectric responses. Owning to the favorable three‐synergistic mechanisms, the best R of 7.22 A W −1 and D of 1.17 × 10 13 Jones are observed, which are enhanced by 1586.8% and 1620.5%, respectively, and the response time is also shortened to 50.17/60.65 µs. Abstract : An innovative CIGS heterojunction is prepared as a self‐powered photodetector (PD). The PD shows high‐performances in a broadband range of 405 to 1064 nm, with responsivity ( R ) of 0.455 A W −1, and detectivity ( D ) of 7.22 × 10 11 Jones. After introducing the pyroelectric and piezoelectric effects, the R and D are vastly enhanced to 7.22 A W −1 and 1.17 × 10 13 Jones with an enhancement of 1586.8% and 1620.5%, respectively, and meanwhile, an ultrafast response speed of 50.17/60.65 µs is obtained. More importantly, the response wavelength is also extended to a longer wavelength of 1550 nm, which far exceeds the spectral limitation of the heterojunction.